326 Agricultural Experiment Station, Ithaca, N. Y. 



While the fungus is progressing through a ])rotliallium when one 

 of these spore balls becomes mature, some of the cells lying adja- 

 cent to healthy cells of the prothallium germinate and grow directly 

 into the new cell host. In doing so the germ tube is very much 

 smaller since less energy is expended in making the perforation 

 through the wall. After emerging from the wall in the new host 

 cell the tube does not enlarge to the size of the tube when germina- 

 tion takes place in water on the glass slip, but remains about the 

 same size as that of the perforation in the wall, until it reaches the' 

 center of the cell lumem where it enlarges into a rotund body as 

 described above. Here it soon grows into the botryoid hyphal 

 mass again. Other cells may germinate and course for a consider- 

 able distance over the surface of the prothallium and enter new 

 host cells quite distant from the hyphal mass, but this has not been 

 observed. In some cases more than one cell lying quite close to a 

 new host cell will germinate and grow into the same. From the 

 observations thus far made I should judge this to be quite common 

 but not general. 



The first ovoid portion of the mycelium in the center of the cell 

 of the host is considerably larger tlian the curved branch which 

 develops at its apex and frequently larger than any which follow. 

 The more slender foi*m of these branches and the close apposition 

 of the branches to the primary enlarged ovoid portion suggests a 

 striking resemblance to an oogonium and antheridium. Thus far 

 I have not seen any conclusive evidence that these organs are pres- 

 ent. However, frequently the conditions are favorable for tlie de- 



Explanation of Plate III. Completoria complens Lohde. 



Figs. 26-30, different plants with mature resting spores, showing the variation 

 in number developed in a single plant; the resting spores surrounded by tlie 

 empty peripheral cells of the plant, which may have developed conidia, or some' 

 of them entered adjacent cells of the prothallinm, or possibly some of them fed 

 the developing resting spores. 



Figs. 31, 32, younger stages in the development of the resting spores. 



Fig 34, plant developing reetihg spores at the center and a eouidium from one 

 of the peripheral cells. 



Fig. 35, conidium germinating; 36, 37 and 39 germinating conidia with the 

 germinal vesicles or proembryos developed from each one. 



Fig. 40, germinal vesicle or proembryo developing the minute entrance tube 

 ■which pierces the wall of the cell of the prothallium ; 38, showing the entrance 

 tube complete and the protoplasm having migrated to the center of the cell 

 where the rotund body is formed ; 41, branching of young plant in cell of host. 



Drawn with aid of camera lucida and magnified 30 times more than the scale. 

 Scale 1 millimeter. 



